Still haven't touched DDO since april, but some thoughts:
Unless something changed the way wolf builds work..
1. Dex to hit and damage doesn't work in wolf form. It's always Str based.
2. Tier 5s in vistani look really weak for wolves, since none of them should work with wolf form. Except mist stalker, but that's not exciting at all. Does the enhancement bonus from blessed blades work? If so it may be good. Otherwise 23 points looks like the sweet spot in the tree for the extra MP and doublestrike bonuses.
Cutting another 18 points somewhere for the 20 MP capstone is probably to much, since that would cost you a lot of base sneak damage from the other trees.
3. I'd probably cut HeM down to 11, like you suggested, cut 1 point from NiS and 1 point from Shintao and the racial tree entirely. That frees up 23 points.
Shadow double still looks like the best tier 5 to take for a wolf build (or does it not stack with rapid slash?).